Shower enclosure



FIG. 1 is a perspective view of the shower enclosure showing our new design;

FIG. 2 is a front perspective view thereof; and,

FIG. 3 is a top plan view thereof.

The broken lines showing of the shower base and drain hole are for illustrative purposes only and forms no part of the claimed design. 

An ornamental design for a shower enclosure, as shown and described. 